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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Methylated cyclodextrins: an efficient protective agent in water for zerovalent ruthenium nanoparticles and a supramolecular shuttle in alkene and arene hydrogenation reactions
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Methylated cyclodextrins: an efficient protective agent in water for zerovalent ruthenium nanoparticles and a supramolecular shuttle in alkene and arene hydrogenation reactions

机译：甲基化环糊精：水中的有效保护剂，用于零价钌纳米颗粒以及烯烃和芳烃氢化反应中的超分子穿梭

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摘要

Zerovalent ruthenium(0) nanoparticles in the size range of 2.5 nm were easily prepared by chemical reduction of ruthenium salt with an excess amount of sodium borohydride and were efficiently stabilized by methylated cyclodextrins. The optimization of the catalytic system has been carried out in terms of stability and catalytic activity, considering the hydrogenation of olefinic compounds under biphasic liquid-liquid conditions. Efficient and controlled chemoselectivities were obtained in the hydrogenation of arene derivatives by the relevant choice of cavity and methylation degree of the cyclodextrins. Finally, the hydrogenation of alpha- and beta-pinenes leads to the major formation of cis-pinanes, interesting synthons for fine chemistry, with high diastereoisomeric excesses.
机译：通过用过量的硼氢化钠化学还原钌盐，可以轻松制备尺寸范围为2.5 nm的零价钌（0）纳米颗粒，并通过甲基化的环糊精有效地稳定了它们。考虑到在双相液-液条件下烯烃化合物的氢化作用，已经在稳定性和催化活性方面进行了催化体系的优化。通过选择环糊精的空穴和甲基化程度，在芳烃衍生物的氢化反应中获得了有效且可控的化学选择性。最后，α-和β-pine烯的氢化导致顺式pin烷的主要形成，顺式pin烷是精细化学的有趣合成子，具有非对映异构体过量。

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